I'm looking to purchase rental properties to supplement my soon-to-be retirement.

Maybe other Californians can supplement this with what they have learned. 

I really enjoy my current job, and my goal with REI is to supplement my W-2 income in order to provide a stable cushion during future economic downturns.

If You Know the Remaining Loan TermUse this calculator if the term length of the remaining loan is known and there is information on the original loan – good for new loans or preexisting loans that have never been supplemented with any external payments.Original Loan AmountOriginal Loan TermyearsInterest RateRemaining TermyearsmonthsRepayment Options:Payback altogetherRepayment with extra payments per month per year one timeBiweekly repaymentNormal repaymentPayoff in 12 years and 7 monthsThe remaining balance is $190,000.00.

I'm attempting to add other income streams to supplement due to this new state of the economy in the meantime.

A supplement to that claim won't matter as much. 

If the goal is just to help supplement your income with these assets, borrow as little as you need and keep your mortgage expenses down.

Maybe once I’ve done enough investing that I want to leave my job (I know that’s not anytime soon) I could wholesale to supplement what I make off of my investments.

I listened to the episode of the BP Podcast with Craig Curelop (#252), and he used Airbnb to supplement his rental income.

Eviction moratoriums (and supplemental unemployment) are now going to be recurring levers that get pulled during recessionary time periods.